Builder's hardware; a manual for architects, builders and house furnishers . by persons not authorized to do so, as it requires very heavyand specially made machinery to produce one of these keys,and unless the corrugations exactly correspond with the lock,the key cannot enter. The plugs are cut by a peculiar formof band-saw specially designed by the manufacturers; andaltogether it seems as if every precaution had been thought ofwhich could render the lock more inviolable. , Like a greatmany other success-ful inventions, theYale locks are re-markable for theirsimplicity. Thewhole of the me-cha
Builder's hardware; a manual for architects, builders and house furnishers . by persons not authorized to do so, as it requires very heavyand specially made machinery to produce one of these keys,and unless the corrugations exactly correspond with the lock,the key cannot enter. The plugs are cut by a peculiar formof band-saw specially designed by the manufacturers; andaltogether it seems as if every precaution had been thought ofwhich could render the lock more inviolable. , Like a greatmany other success-ful inventions, theYale locks are re-markable for theirsimplicity. Thewhole of the me-chanism being prac-tically combined inthe escutcheon,there is no necessityfor any complicatedsystem of levers orsprings in the lockproper, and thereremains very littleto get out of older plugs,made with astraight slot, wouldallow a certainamount of verticalplay to the key,so that it wouldrock in the cut and would not always exactly lift the pins ;besides which the slot permitted the lock to be picked withcomparative ease. This is entirely obviated by the corrugated. Yale Front-Door Mfg. C YLIXDKR L 0 CKS. 2i; slot, as already explained. It will be noticed also that the lockis not in any way dependent upon the springs, as the pins wouldact by gravity, even should the springs give out entirely. It would seem almost an impossibility to master-key a seriesof Yale locks, and yet it is accomplished in two differentways. The first is to fit each lock with a separate master-escutcheon, practically making a double lock, though both setsof escutcheons act on the same locking-bolt. By this method amillion locks could be master-keyed in a single series, ifdesired. The second way is to use three pins in each slotinstead of two, the lengths of the pins being so adjusted that,throughout the series, the upper joints can be brought on a lineby the master-key, while the lower jointings are all different,and fitted to the individual room-keys. This method necessi-tates a larger an
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
